[PR] [SPARK-52092][PYTHON] Add UDF tests for empty DataFrames [spark]

["xinrong-meng (via GitHub)" <gi...@apache.org>]

xinrong-meng opened a new pull request, #50863:
URL: https://github.com/apache/spark/pull/50863

   ### What changes were proposed in this pull request?
   Add UDF tests for empty DataFrames, including Classic Python UDFs, Arrow Python UDFs, and Pandas UDFs.
   
   ### Why are the changes needed?
   To ensure UDFs behave correctly on empty inputs, which is a common edge case.
    
   ### Does this PR introduce _any_ user-facing change?
   No.
   
   
   ### How was this patch tested?
   Test change only.
   
   
   ### Was this patch authored or co-authored using generative AI tooling?
   No.
   


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Re: [PR] [SPARK-52092][PYTHON][TESTS] Add UDF tests for empty DataFrames [spark]

["the-sakthi (via GitHub)" <gi...@apache.org>]

the-sakthi commented on PR #50863:
URL: https://github.com/apache/spark/pull/50863#issuecomment-2877271838

   LGTM


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